chore: release v1.45.0

Add automatic check after article images are inserted: verifies remaining
XIMGPH placeholders and expected vs actual image count. Increase CDP timeout
to 60s and add 3s DOM stabilization delay between image insertions.

.claude-plugin/marketplace.json

@@ -6,7 +6,7 @@
   },
   "metadata": {
     "description": "Skills shared by Baoyu for improving daily work efficiency",
-    "version": "1.43.2"
+    "version": "1.45.0"
   },
   "plugins": [
     {

CHANGELOG.md

@@ -2,6 +2,20 @@
 
 English | [中文](./CHANGELOG.zh.md)
 
+## 1.45.0 - 2026-03-05
+
+### Features
+- `baoyu-post-to-x`: add post-composition verification for X Articles — automatically checks remaining placeholders and image count after all images are inserted
+- `baoyu-post-to-x`: increase CDP timeout to 60s and add 3s DOM stabilization delay between image insertions for long articles
+
+## 1.44.0 - 2026-03-05
+
+### Features
+- `baoyu-url-to-markdown`: add `--download-media` flag to download images and videos to local directories, rewriting markdown links to local paths
+- `baoyu-url-to-markdown`: extract cover image from page meta (og:image) into YAML front matter `coverImage` field
+- `baoyu-url-to-markdown`: handle `data-src` lazy loading for WeChat and similar sites
+- `baoyu-url-to-markdown`: add EXTEND.md preferences with first-time setup for media download behavior
+
 ## 1.43.2 - 2026-03-05
 
 ### Refactor

CHANGELOG.zh.md

@@ -2,6 +2,20 @@
 
 [English](./CHANGELOG.md) | 中文
 
+## 1.45.0 - 2026-03-05
+
+### 新功能
+- `baoyu-post-to-x`：X 文章发布后自动验证——检查残留占位符和图片数量是否正确
+- `baoyu-post-to-x`：增加 CDP 超时至 60 秒，图片插入间隔增加 3 秒 DOM 稳定等待，改善长文章发布稳定性
+
+## 1.44.0 - 2026-03-05
+
+### 新功能
+- `baoyu-url-to-markdown`：新增 `--download-media` 参数，支持下载图片和视频到本地目录，并将 Markdown 中的链接改写为本地路径
+- `baoyu-url-to-markdown`：从页面 meta 信息（og:image）提取封面图，写入 YAML front matter 的 `coverImage` 字段
+- `baoyu-url-to-markdown`：支持 `data-src` 懒加载图片提取（兼容微信公众号等站点）
+- `baoyu-url-to-markdown`：新增 EXTEND.md 偏好设置，支持首次使用引导配置媒体下载行为
+
 ## 1.43.2 - 2026-03-05
 
 ### 重构

skills/baoyu-post-to-x/SKILL.md

@@ -172,6 +172,12 @@ npx -y bun ${SKILL_DIR}/scripts/x-article.ts article.md --cover ./cover.jpg
 
 **Note**: Script opens browser with article filled in. User reviews and publishes manually.
 
+**Post-Composition Check**: The script automatically verifies after all images are inserted:
+- Remaining `XIMGPH_` placeholders in editor content
+- Expected vs actual image count
+
+If the check fails (warnings in output), alert the user with the specific issues before they publish.
+
 ---
 
 ## Troubleshooting

skills/baoyu-post-to-x/references/articles.md

@@ -132,8 +132,12 @@ JSON output:
    - Select the placeholder
    - Copy image to clipboard
    - Paste to replace selection
-9. **Review**: Browser stays open for 60s preview
+9. **Post-Composition Check** (automatic):
-10. **Publish**: Only with `--submit` flag
+   - Scan editor for remaining `XIMGPH_` placeholders
+   - Compare expected vs actual image count
+   - Warn if issues found
+10. **Review**: Browser stays open for 60s preview
+11. **Publish**: Only with `--submit` flag
 
 ## Example Session
 

skills/baoyu-post-to-x/scripts/x-article.ts

@@ -130,7 +130,7 @@ export async function publishArticle(options: ArticleOptions): Promise<void> {
 
   try {
     const wsUrl = await waitForChromeDebugPort(port, 30_000, { includeLastError: true });
-    cdp = await CdpConnection.connect(wsUrl, 30_000, { defaultTimeoutMs: 30_000 });
+    cdp = await CdpConnection.connect(wsUrl, 30_000, { defaultTimeoutMs: 60_000 });
 
     // Get page target
     const targets = await cdp.send<{ targetInfos: Array<{ targetId: string; url: string; type: string }> }>('Target.getTargets');
@@ -148,7 +148,7 @@ export async function publishArticle(options: ArticleOptions): Promise<void> {
     await cdp.send('DOM.enable', {}, { sessionId });
 
     console.log('[x-article] Waiting for articles page...');
-    await sleep(3000);
+    await sleep(1000);
 
     // Wait for and click "create" button
     const waitForElement = async (selector: string, timeoutMs = 60_000): Promise<boolean> => {
@@ -644,6 +644,8 @@ export async function publishArticle(options: ArticleOptions): Promise<void> {
 
         if (imgUploadOk) {
           console.log(`[x-article] Image upload verified (${expectedImgCount} image block(s))`);
+          // Wait for DraftEditor DOM to stabilize after image insertion
+          await sleep(3000);
         } else {
           console.warn(`[x-article] Image upload not detected after 15s`);
           if (i === 0) {
@@ -653,6 +655,42 @@ export async function publishArticle(options: ArticleOptions): Promise<void> {
       }
 
       console.log('[x-article] All images processed.');
+
+      // Final verification: check placeholder residue and image count
+      console.log('[x-article] Running post-composition verification...');
+      const finalEditorContent = await cdp.send<{ result: { value: string } }>('Runtime.evaluate', {
+        expression: `document.querySelector('.DraftEditor-editorContainer [data-contents="true"]')?.innerText || ''`,
+        returnByValue: true,
+      }, { sessionId });
+
+      const remainingPlaceholders: string[] = [];
+      for (const img of parsed.contentImages) {
+        const regex = new RegExp(img.placeholder + '(?!\\d)');
+        if (regex.test(finalEditorContent.result.value)) {
+          remainingPlaceholders.push(img.placeholder);
+        }
+      }
+
+      const finalImgCount = await cdp.send<{ result: { value: number } }>('Runtime.evaluate', {
+        expression: `document.querySelectorAll('section[data-block="true"][contenteditable="false"] img[src^="blob:"]').length`,
+        returnByValue: true,
+      }, { sessionId });
+
+      const expectedCount = parsed.contentImages.length;
+      const actualCount = finalImgCount.result.value;
+
+      if (remainingPlaceholders.length > 0 || actualCount < expectedCount) {
+        console.warn('[x-article] ⚠ POST-COMPOSITION CHECK FAILED:');
+        if (remainingPlaceholders.length > 0) {
+          console.warn(`[x-article]   Remaining placeholders: ${remainingPlaceholders.join(', ')}`);
+        }
+        if (actualCount < expectedCount) {
+          console.warn(`[x-article]   Image count: expected ${expectedCount}, found ${actualCount}`);
+        }
+        console.warn('[x-article]   Please check the article before publishing.');
+      } else {
+        console.log(`[x-article] ✓ Verification passed: ${actualCount} image(s), no remaining placeholders.`);
+      }
     }
 
     // Before preview: blur editor to trigger save

skills/baoyu-url-to-markdown/SKILL.md

@@ -46,10 +46,45 @@ test -f "$HOME/.baoyu-skills/baoyu-url-to-markdown/EXTEND.md" && echo "user"
 ├───────────┼───────────────────────────────────────────────────────────────────────────┤
 │ Found     │ Read, parse, apply settings                                               │
 ├───────────┼───────────────────────────────────────────────────────────────────────────┤
-│ Not found │ Use defaults                                                              │
+│ Not found │ **MUST** run first-time setup (see below) — do NOT silently create defaults │
 └───────────┴───────────────────────────────────────────────────────────────────────────┘
 
-**EXTEND.md Supports**: Default output directory | Default capture mode | Timeout settings
+**EXTEND.md Supports**: Download media by default | Default output directory | Default capture mode | Timeout settings
+
+### First-Time Setup (BLOCKING)
+
+**CRITICAL**: When EXTEND.md is not found, you **MUST use `AskUserQuestion`** to ask the user for their preferences before creating EXTEND.md. **NEVER** create EXTEND.md with defaults without asking. This is a **BLOCKING** operation — do NOT proceed with any conversion until setup is complete.
+
+Use `AskUserQuestion` with ALL questions in ONE call:
+
+**Question 1** — header: "Media", question: "How to handle images and videos in pages?"
+- "Ask each time (Recommended)" — After saving markdown, ask whether to download media
+- "Always download" — Always download media to local imgs/ and videos/ directories
+- "Never download" — Keep original remote URLs in markdown
+
+**Question 2** — header: "Output", question: "Default output directory?"
+- "url-to-markdown (Recommended)" — Save to ./url-to-markdown/{domain}/{slug}.md
+- (User may choose "Other" to type a custom path)
+
+**Question 3** — header: "Save", question: "Where to save preferences?"
+- "User (Recommended)" — ~/.baoyu-skills/ (all projects)
+- "Project" — .baoyu-skills/ (this project only)
+
+After user answers, create EXTEND.md at the chosen location, confirm "Preferences saved to [path]", then continue.
+
+Full reference: [references/config/first-time-setup.md](references/config/first-time-setup.md)
+
+### Supported Keys
+
+| Key | Default | Values | Description |
+|-----|---------|--------|-------------|
+| `download_media` | `ask` | `ask` / `1` / `0` | `ask` = prompt each time, `1` = always download, `0` = never |
+| `default_output_dir` | empty | path or empty | Default output directory (empty = `./url-to-markdown/`) |
+
+**Value priority**:
+1. CLI arguments (`--download-media`, `-o`)
+2. EXTEND.md
+3. Skill defaults
 
 ## Features
 
@@ -57,6 +92,7 @@ test -f "$HOME/.baoyu-skills/baoyu-url-to-markdown/EXTEND.md" && echo "user"
 - Two capture modes: auto or wait-for-user
 - Clean markdown output with metadata
 - Handles login-required pages via wait mode
+- Download images and videos to local directories
 
 ## Usage
 
@@ -69,6 +105,9 @@ npx -y bun ${SKILL_DIR}/scripts/main.ts <url> --wait
 
 # Save to specific file
 npx -y bun ${SKILL_DIR}/scripts/main.ts <url> -o output.md
+
+# Download images and videos to local directories
+npx -y bun ${SKILL_DIR}/scripts/main.ts <url> --download-media
 ```
 
 ## Options
@@ -79,6 +118,7 @@ npx -y bun ${SKILL_DIR}/scripts/main.ts <url> -o output.md
 | `-o <path>` | Output file path (default: auto-generated) |
 | `--wait` | Wait for user signal before capturing |
 | `--timeout <ms>` | Page load timeout (default: 30000) |
+| `--download-media` | Download image/video assets to local `imgs/` and `videos/`, and rewrite markdown links to local relative paths |
 
 ## Capture Modes
 
@@ -105,6 +145,32 @@ url-to-markdown/<domain>/<slug>.md
 - `<slug>`: From page title or URL path (kebab-case, 2-6 words)
 - Conflict resolution: Append timestamp `<slug>-YYYYMMDD-HHMMSS.md`
 
+When `--download-media` is enabled:
+- Images are saved to `imgs/` next to the markdown file
+- Videos are saved to `videos/` next to the markdown file
+- Markdown media links are rewritten to local relative paths
+
+## Media Download Workflow
+
+Based on `download_media` setting in EXTEND.md:
+
+| Setting | Behavior |
+|---------|----------|
+| `1` (always) | Run script with `--download-media` flag |
+| `0` (never) | Run script without `--download-media` flag |
+| `ask` (default) | Follow the ask-each-time flow below |
+
+### Ask-Each-Time Flow
+
+1. Run script **without** `--download-media` → markdown saved
+2. Check saved markdown for remote media URLs (`https://` in image/video links)
+3. **If no remote media found** → done, no prompt needed
+4. **If remote media found** → use `AskUserQuestion`:
+   - header: "Media", question: "Download N images/videos to local files?"
+   - "Yes" — Download to local directories
+   - "No" — Keep remote URLs
+5. If user confirms → run script **again** with `--download-media` (overwrites markdown with localized links)
+
 ## Environment Variables
 
 | Variable | Description |

skills/baoyu-url-to-markdown/references/config/first-time-setup.md

@@ -0,0 +1,106 @@
+---
+name: first-time-setup
+description: First-time setup flow for baoyu-url-to-markdown preferences
+---
+
+# First-Time Setup
+
+## Overview
+
+When no EXTEND.md is found, guide user through preference setup.
+
+**BLOCKING OPERATION**: This setup MUST complete before ANY other workflow steps. Do NOT:
+- Start converting URLs
+- Ask about URLs or output paths
+- Proceed to any conversion
+
+ONLY ask the questions in this setup flow, save EXTEND.md, then continue.
+
+## Setup Flow
+
+```
+No EXTEND.md found
+        |
+        v
++---------------------+
+| AskUserQuestion     |
+| (all questions)     |
++---------------------+
+        |
+        v
++---------------------+
+| Create EXTEND.md    |
++---------------------+
+        |
+        v
+    Continue conversion
+```
+
+## Questions
+
+**Language**: Use user's input language or saved language preference.
+
+Use AskUserQuestion with ALL questions in ONE call:
+
+### Question 1: Download Media
+
+```yaml
+header: "Media"
+question: "How to handle images and videos in pages?"
+options:
+  - label: "Ask each time (Recommended)"
+    description: "After saving markdown, ask whether to download media"
+  - label: "Always download"
+    description: "Always download media to local imgs/ and videos/ directories"
+  - label: "Never download"
+    description: "Keep original remote URLs in markdown"
+```
+
+### Question 2: Default Output Directory
+
+```yaml
+header: "Output"
+question: "Default output directory?"
+options:
+  - label: "url-to-markdown (Recommended)"
+    description: "Save to ./url-to-markdown/{domain}/{slug}.md"
+```
+
+Note: User will likely choose "Other" to type a custom path.
+
+### Question 3: Save Location
+
+```yaml
+header: "Save"
+question: "Where to save preferences?"
+options:
+  - label: "User (Recommended)"
+    description: "~/.baoyu-skills/ (all projects)"
+  - label: "Project"
+    description: ".baoyu-skills/ (this project only)"
+```
+
+## Save Locations
+
+| Choice | Path | Scope |
+|--------|------|-------|
+| User | `~/.baoyu-skills/baoyu-url-to-markdown/EXTEND.md` | All projects |
+| Project | `.baoyu-skills/baoyu-url-to-markdown/EXTEND.md` | Current project |
+
+## After Setup
+
+1. Create directory if needed
+2. Write EXTEND.md
+3. Confirm: "Preferences saved to [path]"
+4. Continue with conversion using saved preferences
+
+## EXTEND.md Template
+
+```md
+download_media: [ask/1/0]
+default_output_dir: [path or empty]
+```
+
+## Modifying Preferences Later
+
+Users can edit EXTEND.md directly or delete it to trigger setup again.

skills/baoyu-url-to-markdown/scripts/html-to-markdown.ts

@@ -7,6 +7,7 @@ export interface PageMetadata {
   description?: string;
   author?: string;
   published?: string;
+  coverImage?: string;
   captured_at: string;
 }
 
@@ -39,6 +40,12 @@ export const absolutizeUrlsScript = String.raw`
       }).filter(Boolean).join(", "));
     });
   }
+  document.querySelectorAll("img[data-src], video[data-src], audio[data-src], source[data-src]").forEach(el => {
+    const ds = el.getAttribute("data-src");
+    if (ds && (!el.getAttribute("src") || el.getAttribute("src") === "" || el.getAttribute("src")?.startsWith("data:"))) {
+      el.setAttribute("src", ds);
+    }
+  });
   absAttr("a[href]", "href");
   absAttr("img[src], video[src], audio[src], source[src]", "src");
   absSrcset("img[srcset], source[srcset]");
@@ -56,6 +63,7 @@ export async function extractContent(html: string, url: string): Promise<Convers
     description: result.description || undefined,
     author: result.author || undefined,
     published: result.published || undefined,
+    coverImage: result.image || undefined,
     captured_at: new Date().toISOString(),
   };
 
@@ -73,6 +81,7 @@ export function formatMetadataYaml(meta: PageMetadata): string {
   if (meta.description) lines.push(`description: "${escapeYamlValue(meta.description)}"`);
   if (meta.author) lines.push(`author: "${escapeYamlValue(meta.author)}"`);
   if (meta.published) lines.push(`published: "${escapeYamlValue(meta.published)}"`);
+  if (meta.coverImage) lines.push(`coverImage: "${escapeYamlValue(meta.coverImage)}"`);
   lines.push(`captured_at: "${escapeYamlValue(meta.captured_at)}"`);
   lines.push("---");
   return lines.join("\n");

skills/baoyu-url-to-markdown/scripts/main.ts

@@ -5,6 +5,7 @@ import process from "node:process";
 
 import { CdpConnection, getFreePort, launchChrome, waitForChromeDebugPort, waitForNetworkIdle, waitForPageLoad, autoScroll, evaluateScript, killChrome } from "./cdp.js";
 import { absolutizeUrlsScript, extractContent, createMarkdownDocument, type ConversionResult } from "./html-to-markdown.js";
+import { localizeMarkdownMedia, countRemoteMedia } from "./media-localizer.js";
 import { resolveUrlToMarkdownDataDir } from "./paths.js";
 import { DEFAULT_TIMEOUT_MS, CDP_CONNECT_TIMEOUT_MS, NETWORK_IDLE_TIMEOUT_MS, POST_LOAD_DELAY_MS, SCROLL_STEP_WAIT_MS, SCROLL_MAX_STEPS } from "./constants.js";
 
@@ -26,10 +27,11 @@ interface Args {
   output?: string;
   wait: boolean;
   timeout: number;
+  downloadMedia: boolean;
 }
 
 function parseArgs(argv: string[]): Args {
-  const args: Args = { url: "", wait: false, timeout: DEFAULT_TIMEOUT_MS };
+  const args: Args = { url: "", wait: false, timeout: DEFAULT_TIMEOUT_MS, downloadMedia: false };
   for (let i = 2; i < argv.length; i++) {
     const arg = argv[i];
     if (arg === "--wait" || arg === "-w") {
@@ -38,6 +40,8 @@ function parseArgs(argv: string[]): Args {
       args.output = argv[++i];
     } else if (arg === "--timeout" || arg === "-t") {
       args.timeout = parseInt(argv[++i], 10) || DEFAULT_TIMEOUT_MS;
+    } else if (arg === "--download-media") {
+      args.downloadMedia = true;
     } else if (!arg.startsWith("-") && !args.url) {
       args.url = arg;
     }
@@ -153,7 +157,24 @@ async function main(): Promise<void> {
   const outputDir = path.dirname(outputPath);
   await mkdir(outputDir, { recursive: true });
 
-  const document = createMarkdownDocument(result);
+  let document = createMarkdownDocument(result);
+
+  if (args.downloadMedia) {
+    const mediaResult = await localizeMarkdownMedia(document, {
+      markdownPath: outputPath,
+      log: console.log,
+    });
+    document = mediaResult.markdown;
+    if (mediaResult.downloadedImages > 0 || mediaResult.downloadedVideos > 0) {
+      console.log(`Downloaded: ${mediaResult.downloadedImages} images, ${mediaResult.downloadedVideos} videos`);
+    }
+  } else {
+    const { images, videos } = countRemoteMedia(document);
+    if (images > 0 || videos > 0) {
+      console.log(`Remote media found: ${images} images, ${videos} videos`);
+    }
+  }
+
   await writeFile(outputPath, document, "utf-8");
 
   console.log(`Saved: ${outputPath}`);

skills/baoyu-url-to-markdown/scripts/media-localizer.ts

@@ -0,0 +1,317 @@
+import path from "node:path";
+import { mkdir, writeFile } from "node:fs/promises";
+
+type MediaKind = "image" | "video";
+type MediaHint = "image" | "unknown";
+
+type MarkdownLinkCandidate = {
+  url: string;
+  hint: MediaHint;
+};
+
+export type LocalizeMarkdownMediaOptions = {
+  markdownPath: string;
+  log?: (message: string) => void;
+};
+
+export type LocalizeMarkdownMediaResult = {
+  markdown: string;
+  downloadedImages: number;
+  downloadedVideos: number;
+  imageDir: string | null;
+  videoDir: string | null;
+};
+
+const MARKDOWN_LINK_RE = /(!?\[[^\]\n]*\])\((<)?(https?:\/\/[^)\s>]+)(>)?\)/g;
+const FRONTMATTER_COVER_RE = /^(coverImage:\s*")(https?:\/\/[^"]+)(")/m;
+
+const IMAGE_EXTENSIONS = new Set([
+  "jpg",
+  "jpeg",
+  "png",
+  "webp",
+  "gif",
+  "bmp",
+  "avif",
+  "heic",
+  "heif",
+  "svg",
+]);
+
+const VIDEO_EXTENSIONS = new Set(["mp4", "m4v", "mov", "webm", "mkv"]);
+
+const MIME_EXTENSION_MAP: Record<string, string> = {
+  "image/jpeg": "jpg",
+  "image/jpg": "jpg",
+  "image/png": "png",
+  "image/webp": "webp",
+  "image/gif": "gif",
+  "image/bmp": "bmp",
+  "image/avif": "avif",
+  "image/heic": "heic",
+  "image/heif": "heif",
+  "image/svg+xml": "svg",
+  "video/mp4": "mp4",
+  "video/webm": "webm",
+  "video/quicktime": "mov",
+  "video/x-m4v": "m4v",
+};
+
+const DOWNLOAD_USER_AGENT =
+  "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36";
+
+function normalizeContentType(raw: string | null): string {
+  return raw?.split(";")[0]?.trim().toLowerCase() ?? "";
+}
+
+function normalizeExtension(raw: string | undefined | null): string | undefined {
+  if (!raw) return undefined;
+  const trimmed = raw.replace(/^\./, "").trim().toLowerCase();
+  if (!trimmed) return undefined;
+  if (trimmed === "jpeg") return "jpg";
+  if (trimmed === "jpg") return "jpg";
+  return trimmed;
+}
+
+function resolveExtensionFromUrl(rawUrl: string): string | undefined {
+  try {
+    const parsed = new URL(rawUrl);
+    const extFromPath = normalizeExtension(path.posix.extname(parsed.pathname));
+    if (extFromPath) return extFromPath;
+    const extFromFormat = normalizeExtension(parsed.searchParams.get("format"));
+    if (extFromFormat) return extFromFormat;
+  } catch {
+    return undefined;
+  }
+  return undefined;
+}
+
+function resolveKindFromContentType(contentType: string): MediaKind | undefined {
+  if (!contentType) return undefined;
+  if (contentType.startsWith("image/")) return "image";
+  if (contentType.startsWith("video/")) return "video";
+  return undefined;
+}
+
+function resolveKindFromExtension(ext: string | undefined): MediaKind | undefined {
+  if (!ext) return undefined;
+  if (IMAGE_EXTENSIONS.has(ext)) return "image";
+  if (VIDEO_EXTENSIONS.has(ext)) return "video";
+  return undefined;
+}
+
+function resolveMediaKind(
+  rawUrl: string,
+  contentType: string,
+  extension: string | undefined,
+  hint: MediaHint
+): MediaKind | undefined {
+  const kindFromType = resolveKindFromContentType(contentType);
+  if (kindFromType) return kindFromType;
+
+  const kindFromExtension = resolveKindFromExtension(extension);
+  if (kindFromExtension) return kindFromExtension;
+
+  if (contentType && contentType !== "application/octet-stream") {
+    return undefined;
+  }
+
+  return hint === "image" ? "image" : undefined;
+}
+
+function resolveOutputExtension(
+  contentType: string,
+  extension: string | undefined,
+  kind: MediaKind
+): string {
+  const extFromMime = normalizeExtension(MIME_EXTENSION_MAP[contentType]);
+  if (extFromMime) return extFromMime;
+
+  const normalizedExt = normalizeExtension(extension);
+  if (normalizedExt) return normalizedExt;
+
+  return kind === "video" ? "mp4" : "jpg";
+}
+
+function safeDecodeURIComponent(value: string): string {
+  try {
+    return decodeURIComponent(value);
+  } catch {
+    return value;
+  }
+}
+
+function sanitizeFileSegment(input: string): string {
+  return input
+    .replace(/[^a-zA-Z0-9_-]+/g, "-")
+    .replace(/-+/g, "-")
+    .replace(/^[-_]+|[-_]+$/g, "")
+    .slice(0, 48);
+}
+
+function resolveFileStem(rawUrl: string, extension: string): string {
+  try {
+    const parsed = new URL(rawUrl);
+    const base = path.posix.basename(parsed.pathname);
+    if (!base) return "";
+    const decodedBase = safeDecodeURIComponent(base);
+    const normalizedExt = normalizeExtension(extension);
+    const stripExt = normalizedExt ? new RegExp(`\\.${normalizedExt}$`, "i") : null;
+    const rawStem = stripExt ? decodedBase.replace(stripExt, "") : decodedBase;
+    return sanitizeFileSegment(rawStem);
+  } catch {
+    return "";
+  }
+}
+
+function buildFileName(kind: MediaKind, index: number, sourceUrl: string, extension: string): string {
+  const stem = resolveFileStem(sourceUrl, extension);
+  const prefix = kind === "image" ? "img" : "video";
+  const serial = String(index).padStart(3, "0");
+  const suffix = stem ? `-${stem}` : "";
+  return `${prefix}-${serial}${suffix}.${extension}`;
+}
+
+function collectMarkdownLinkCandidates(markdown: string): MarkdownLinkCandidate[] {
+  const candidates: MarkdownLinkCandidate[] = [];
+  const seen = new Set<string>();
+
+  const fmMatch = markdown.match(/^---\n([\s\S]*?)\n---/);
+  if (fmMatch) {
+    const coverMatch = fmMatch[1]?.match(FRONTMATTER_COVER_RE);
+    if (coverMatch?.[2] && !seen.has(coverMatch[2])) {
+      seen.add(coverMatch[2]);
+      candidates.push({ url: coverMatch[2], hint: "image" });
+    }
+  }
+
+  MARKDOWN_LINK_RE.lastIndex = 0;
+  let match: RegExpExecArray | null;
+  while ((match = MARKDOWN_LINK_RE.exec(markdown))) {
+    const label = match[1] ?? "";
+    const rawUrl = match[3] ?? "";
+    if (!rawUrl || seen.has(rawUrl)) continue;
+    seen.add(rawUrl);
+    candidates.push({
+      url: rawUrl,
+      hint: label.startsWith("![") ? "image" : "unknown",
+    });
+  }
+
+  return candidates;
+}
+
+function rewriteMarkdownMediaLinks(markdown: string, replacements: Map<string, string>): string {
+  if (replacements.size === 0) return markdown;
+  MARKDOWN_LINK_RE.lastIndex = 0;
+
+  let result = markdown.replace(MARKDOWN_LINK_RE, (full, label, _openAngle, rawUrl) => {
+    const localPath = replacements.get(rawUrl);
+    if (!localPath) return full;
+    return `${label}(${localPath})`;
+  });
+
+  result = result.replace(FRONTMATTER_COVER_RE, (full, prefix, rawUrl, suffix) => {
+    const localPath = replacements.get(rawUrl);
+    if (!localPath) return full;
+    return `${prefix}${localPath}${suffix}`;
+  });
+
+  return result;
+}
+
+export async function localizeMarkdownMedia(
+  markdown: string,
+  options: LocalizeMarkdownMediaOptions
+): Promise<LocalizeMarkdownMediaResult> {
+  const log = options.log ?? (() => {});
+  const markdownDir = path.dirname(options.markdownPath);
+  const candidates = collectMarkdownLinkCandidates(markdown);
+
+  if (candidates.length === 0) {
+    return {
+      markdown,
+      downloadedImages: 0,
+      downloadedVideos: 0,
+      imageDir: null,
+      videoDir: null,
+    };
+  }
+
+  const replacements = new Map<string, string>();
+  let downloadedImages = 0;
+  let downloadedVideos = 0;
+
+  for (const candidate of candidates) {
+    try {
+      const response = await fetch(candidate.url, {
+        method: "GET",
+        redirect: "follow",
+        headers: {
+          "user-agent": DOWNLOAD_USER_AGENT,
+        },
+      });
+
+      if (!response.ok) {
+        log(`[url-to-markdown] Skip media (${response.status}): ${candidate.url}`);
+        continue;
+      }
+
+      const sourceUrl = response.url || candidate.url;
+      const contentType = normalizeContentType(response.headers.get("content-type"));
+      const extension = resolveExtensionFromUrl(sourceUrl) ?? resolveExtensionFromUrl(candidate.url);
+      const kind = resolveMediaKind(sourceUrl, contentType, extension, candidate.hint);
+      if (!kind) {
+        continue;
+      }
+
+      const outputExtension = resolveOutputExtension(contentType, extension, kind);
+      const nextIndex = kind === "image" ? downloadedImages + 1 : downloadedVideos + 1;
+      const dirName = kind === "image" ? "imgs" : "videos";
+      const targetDir = path.join(markdownDir, dirName);
+      await mkdir(targetDir, { recursive: true });
+
+      const fileName = buildFileName(kind, nextIndex, sourceUrl, outputExtension);
+      const absolutePath = path.join(targetDir, fileName);
+      const relativePath = path.posix.join(dirName, fileName);
+      const bytes = Buffer.from(await response.arrayBuffer());
+      await writeFile(absolutePath, bytes);
+      replacements.set(candidate.url, relativePath);
+
+      if (kind === "image") {
+        downloadedImages = nextIndex;
+      } else {
+        downloadedVideos = nextIndex;
+      }
+    } catch (error) {
+      const message = error instanceof Error ? error.message : String(error ?? "");
+      log(`[url-to-markdown] Failed to download media ${candidate.url}: ${message}`);
+    }
+  }
+
+  return {
+    markdown: rewriteMarkdownMediaLinks(markdown, replacements),
+    downloadedImages,
+    downloadedVideos,
+    imageDir: downloadedImages > 0 ? path.join(markdownDir, "imgs") : null,
+    videoDir: downloadedVideos > 0 ? path.join(markdownDir, "videos") : null,
+  };
+}
+
+export function countRemoteMedia(markdown: string): { images: number; videos: number; hasCoverImage: boolean } {
+  const fmMatch = markdown.match(/^---\n([\s\S]*?)\n---/);
+  const hasCoverImage = !!(fmMatch?.[1]?.match(FRONTMATTER_COVER_RE)?.[2]);
+  const candidates = collectMarkdownLinkCandidates(markdown);
+  let images = 0;
+  let videos = 0;
+  for (const c of candidates) {
+    const ext = resolveExtensionFromUrl(c.url);
+    const kind = resolveKindFromExtension(ext);
+    if (kind === "video") {
+      videos++;
+    } else if (kind === "image" || c.hint === "image") {
+      images++;
+    }
+  }
+  return { images, videos, hasCoverImage };
+}